Section Descriptor (SED)

b10b16fieldtypesizebitfieldcomment
00fnshort  used internally by Word
22fcSepxFC  file offset in main stream to beginning of SEPX stored for section. If sed.fcSepx == 0xFFFFFFFF, the section properties for the section are equal to the standard SEP (see SEP definition).
66fnMprshort  used internally by Word
88fcMprFC  points to offset in FC space of main stream where the Macintosh Print Record for a document created on a Mac will be stored

cbSED (count of bytes of SED) is 12 (decimal), C (hex).